28 Aug
2007
28 Aug
'07
5:05 p.m.
On 28 Aug 2007 at 14:56, Chris M wrote:
as most of us know, the IBM PC and PC/AT (I think)
have extra rom sockets. If you want to obtain a dump
of an eprom, could you simply plug them into these
spare sockets and use Debug or whatever to capture an
image? Seems straitforward enough, but I figured it
wouldn't hurt to ask...
Sure, but with the proviso that the AT sockets are paired as high-
order and low-order bytes in a 16 bit word. So alternate bytes
represent the content of each ROM.
The IBM PC (5150) used a 24-pin 64Kbit ROM, which doesn't match up
with most EPROM pinouts (I think that the Moto 68764 is one of the
few 24-pin UV EPROMs that will work). So the PC may not be the best
thing to use for general EPROM dumping.
On the other hand, many ISA boards have EPROM sockets for BIOS
extension support. One could use a socket on one of those boards
(say, a network card) for the same purpose.
Cheers,
Chuck